Including a water slide under a city's green credentials would normally feel like pushing your luck, however. Unless, of course, you build it in the middle of a steep, busy thoroughfare normally clogged with traffic...

True, it's a temporary art installation. But, as the aforementioned mayor George Ferguson says in the video below, nobody will be able to walk down Park Street again without understanding it's a place not just for cars, but for people to have fun too.